Automatic safety sash-lock.



V T..J. GIBSON. AUTOMATIC SAFETY SASH LOOK.

APPLIOATION'IILED Ami. 14. 1808.

909,783. Patented Jan.12,1909.

TOLLIE JEFFERSON GIBSON, OF ST. LCUIS, MlSSOUl-H.

euroam'rro earner sass-Loon.

Specification of Letters Patent.

Patented Jan. 12,, 1909.

Application filed April 14, 19055. Serial No. 427,028.

To all whom it may concern:

Be it known that I, ToLLIE Jnrrnnson Gm SON, a citizen of the United States, residing at St. Louis, in the county of St. Louis City and State of Missouri, have invented new and useful Improvements in Automatic Safety Sash-Locks, of which the following is a specification.

This invention is an improved sash lock adapted to secure window sashes, either in a closed or partly open position and the said invention consists in the construction, COIl1- bination and arrangement of devices hereinaiter described and claimed.

The object of this invention is to provide an improved form or sash lock which is extremely cheap and simple in construction, is readily installed inplace and is etlicient for use in locking a window sash either in a closed or partly opened position.

In the accompanying drawings, is a. sectional view, showing my improved sash lock in use. Fig. 2 is a transverse sectional view of the same. Fig. 3 is a plan of the same; Fig. 4 is a detail perspective view of the sash loclr casing.

'The casing l of my improved sash lock is rectangular in form and is made from a single blank of sheet metal bent and cut to provide the side walls 2, connecting inner .end wall 4, the top 5 and. the bottom 6. The side walls are formed at their outer edges with outwardly extending ears 7 with inwardly bent portions 8 and the side wall 2 is further provided between its ears 7 with an inwardly bent outer end portion 9 thereby providing. an opening'in the front or outer side of the casing between the said portion 9 and the side wall 3. The side walls are provided with bearing openings Figure 1 10 for the spindles or shaftends of a gearwheel 11 and a ratchet wheel 12 which are secured together for simultaneous revolution. One side of the gear 11 projects through the opening in the outer side of the casing to adapt said gear to engage a rack bar 13 of suitable length which is secured in one side of a sash a, the lock casing being mortised in one upper corner of a sash 6.

Within the lock case is a spring pawl 1.4, the lower end of which is secured to the wall 2 and is upturned at 15 and provided another sash and having with openings for the reception of screws or rivet-s employed to secure it to such wall. The said pawl, which engages the ratchet wheel 12 is provided with an upwardly GXA tending handle 16 which operates in and,

passes through an opening 17 in the top of the lock casing. The lockin casing in the sash o-is opposite the rack ar 13 so that said rack bar is engaged by the gear-wheel 11.

It will be understood from an inspection of Fig. 1 that the sash b may be lowered to any desired extent, the gear 11 by reason of its engagement with the rack 13 turning as the sash moves and causing the ratchetwheel 12 to turn, the teeth of said ratchet extending in such direction that the pawl 14 allows said ratchet wheel to rotate. As soon as the sash isrele'ased whether it he when the sash is entirely closed or left partially open, the pawl by its sprin action reengages the ratchet wheel and tense loclrs the sash in position. Before the, sash can he again raised the pawl must he tripped or disengaged from the ratchet wheel by I means of its upwardly extending" handle 16. To prevent the handle from being hperated by an instrument employed by some one without the window 1 provide a locking device 18 which is pivotally mounted on the I top or the casing 1 and may be readily turned into and out of engagement with the handle of the pawl as may he desired. It will he understood that the teeth of the rack bar and of the gear 11 may be of any suitable form. I do not desire to limit myself in this particular neither do I desire to limit myself to the precise construction and arrangement of devices herein shown and described as it is evident that modifications may be made therein within the scope of the appended claim.

Having thus described the inventionywhat I claim as new and desire tosecure hy listters Patent is:

A sash locking device comprising, in combination with av rack bar for attachment to one sash, a casing having means whereby it. may be secured, with one side exposed, to l a slot in said exposed side, a gear in engagement with said rack bar, mounted in said casing, a ratchet wheel in. said casing revoluble with said.

\ a handle extending in said slot and projectgear, a spring pawl in said casing normally] movable into and out of engagement with engaging said ratchet wheel, said spring said pawl for the purposes set forth. pawl having one end secured to the wall of In testimony whereof I affix my signature the casing and at the opposite end. having in presence of two witnesses.

i TOLLIE JEFFERSON GIBSON.

Witnesses:

PAUL JARzEMsKY, GEO. L. Kmson.

ing from the exposed side of said casing and a locking device pivotally mounted on the exposed slotted side of the casing and i 

